Store all your external libraries as a local copy in your internal repositories so that your are not affected by mistakes or vulnerabilities that affect the public code repositories ( such as NPM public repository for java – see details here on how it badly affected many applications https://www.theregister.co.uk/AMP/2016/03/23/npm_left_pad_chaos/ )

Using a bigger memory tier could cause allocation of better CPU allocation which can bring your transaction processing speed from seconds to sub seconds

Monitor performance metrics of your application to determine when it changed and why

You must monitor for errors in your code. Don’t assume its working well

Using Lambda inside VPC requires attention to security groups same as for an EC2 instance

Make sure your Lambda function has the least privileges required in its IAM policy

AWS Toolkit for Eclipse: Support for Creating Maven Projects for AWS, Lambda, and Serverless Applications http://bit.ly/2muxucL